/*
 * Copyright (c) 2023-2023 elsfs Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.elsfs.cloud.common.datasource.support;

import com.baomidou.dynamic.datasource.processor.DsProcessor;
import com.baomidou.dynamic.datasource.toolkit.DynamicDataSourceContextHolder;
import org.aopalliance.intercept.MethodInvocation;

/**
 * 参数数据源解析 @DS("#last)
 *
 * @author zeng
 */
public class LastParamDsProcessor extends DsProcessor {
  private static final String LAST_PREFIX = "#last";

  /**
   * 抽象匹配条件 匹配才会走当前执行器否则走下一级执行器
   *
   * @param key DS注解里的内容
   * @return 是否匹配
   */
  @Override
  public boolean matches(String key) {
    if (key.startsWith(LAST_PREFIX)) {
      // https://github.com/baomidou/dynamic-datasource-spring-boot-starter/issues/213
      DynamicDataSourceContextHolder.clear();
      return true;
    }
    return false;
  }

  /**
   * 抽象最终决定数据源
   *
   * @param invocation 方法执行信息
   * @param key DS注解里的内容
   * @return 数据源名称
   */
  @Override
  public String doDetermineDatasource(MethodInvocation invocation, String key) {
    Object[] arguments = invocation.getArguments();
    return String.valueOf(arguments[arguments.length - 1]);
  }
}
